Halloween has become Britain's biggest autumn festival, replacing Bonfire Night which this year will mark the 400th anniversary of the Gunpowder Plot.

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Thousands more are expected to celebrate the U.S. festival than Bonfire Night on Saturday, the Daily Mail reports. Retailers say Halloween is now the third most popular annual festival after Christmas and Easter.

Britons are expected to spend an estimated $214 million on Halloween this year, or 10 times more than what was spent five years ago.

The Bonfire Night refers to a plot by 13 young men in 1605 planning to blow up the parliament. Among them was Guy Fawkes, Britain's most notorious traitor, who was later captured on Nov. 5. The country celebrates with bonfires and fireworks and marked by burning an effigy of Fawkes.